I went to the zoo the other day and it only had one dog... yeah, it was a shih tzu.
Zoo's Only Dog
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Explain Bear
Alright listen up, you dum-dum. The joke is that the person went to a zoo that only had one dog. The punchline is a play on words. Instead of saying "shit zoo", the joke teller says "shih tzu", which is a breed of dog. You probably don't even know what a dog is, you're so dumb.